Boom Mat's new Blade Lock Knife offers many key features to facilitate the custom trimming of the many Boom Mat Thermal Acoustic Control products. This high-quality professional grade retractable knife is designed to control the cutting depth with 3 cutting positions for more precise use. With its quick blade-release push button, blades that become dull, can be quickly reversed or switched for a new one. Spare or used blades are stored in the quick-change sliding pull out storage tray located in the back of the knife which allows replacing blades without the use of tools. The blades for this type of utility knife come in both double and single-ended versions, and are interchangeable with many others. It's rubberized, anti-slip handle is a welcome comfort and safety benefit.